The billions of dollars of revenues of mobile network operators from SMS have been strongly declining in the last 2-3 years. Especially in European and Asian countries where flat rates for texting are less common, users have quickly adopted over-the-top (OTT) messaging apps to avoid costs. As of today far more messages are sent with Whatsapp, Line, Kakao Talk, Viber, etc. than by traditional texting/SMS of mobile network operators.
Clones of leading messaging apps
Trying to counteract this trend many mobile network operators have launched their own messaging apps in recent months. Telefonica launched TuMe, Vodafone and Deutsche Telekom started to offer Joyn, and this week Swisscom followed with iO. There are several more examples like these. All of these messaging apps have one thing in common: They are more or less clones of the leading messaging apps.
These clones should basically replace your standard messaging app on your mobile device and offer some additional features. With the mobile network operator apps you can send text messages and exchange single photos. Some of them feature location attachments and voice messages as well as simple group chats. VOIP calls and video chats are also available on some of these apps.
Currently minor performance and no new features
From a user interface and design perspective TuMe and iO look solid, while Joyn shows a very basic and text-centric design. From a performance perspective most of them are still buggy and not the fastest messaging apps. However, the apps are still pretty new and over time this will hopefully change.

TuMe App

Joyn App
Initially free of charge with additional features coming at cost
The apps are a free download. The usage of messaging features should be free of charge, but this could depend on your tariff and on the mobile network operator (so if you decide to use one of the apps, make sure you check). VOIP and video chat features should be expected to come at a cost sooner or later.
Overall, the messaging apps of mobile network operators offer nothing new or special. With the current performance and features of these apps, there are no reasons for users to switch. Further, the innovation in the instant messaging space is still expected from the market leaders. And the clones will only follow the herd.